Upside down kuzo close up

On the reverse of the mezuzah behind the Hashem elokeynu Hashem of the first line is the text ‘kuzo b’mochsez kuzo’written upside down. These are the next letters on in the Hebrew alphabet and have some kabbalistic symbolism, perhaps to do with God in motion, i.e. a continuous presence. Maimonides felt very strongly that this custom should not be pursued.